Crystal has face centred cubic structure, having atomic weight `6.023y g mol^-1`. If the minimum distance between two atoms is `y^(1//3)` nm and the observed density is `20 kg m^-3` find density in `Kg m^-3`.

Explanation

`d=(ZxxM)//(a^3xxN_A)=(4xx6.023xxy)//[(2y^(1//3)xx10^-9)^3xx6.023xx10^23]=5xx10^3g m^-3=5 kg m^-3`